{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical", "Disease"], "input": "Higher metoprolol / alpha - hydroxymetoprolol ratios in PMs were predictive for higher R - / S - isomer ratios of unchanged drug ."}
{"Chemical": ["metoprolol", "alpha - hydroxymetoprolol"], "Disease": []}